Fill in the blank with one of the words or phrases listed below. 
An angle that measures 90° is called a(n) 
angle.
A. straight
B. supplementary
C. right
D. complementary
Answer: C
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Find the derivative of y with respect to x, t, or ?, as appropriate.y = sin e-?7
A. cos (-7?6 e-?7) B. cos e-?7 C. (-7?6 e-?7) cos e-?7 D. 7?6cos e-?7
Solve the problem.A boat is towed toward a dock by a cable attached to a winch that stands 15 ft above the water level (see figure). Let ? be the angle of elevation of the winch and let z be the length of the cable as the boat is towed toward the dock. Compute 
when 
A. 
= -0.00030
B. 
= -0.00418
C. 
= -0.26287
D. 
= -0.00446
Factor by grouping.ax - bx - ay + by
A. (x - y)(a + b) B. (x - y)(a - b) C. (x + y)(a - b) D. (x + y)(a + b)
Simplify the expression. Assume that all variables are positive when they appear.(9
)(9
)
A. 567
B. 567
C. 81
D. 3969